[Vm-dev] Dalvik vs. ART: Android virtual machines and the battle for better performance | Pocketnow

Nicolas Cellier nicolas.cellier.aka.nice at gmail.com
Fri Dec 13 01:16:10 UTC 2013


That's completely germane, but he didn't say 100% faster, it's me that said
twice as fast.
Speed is measurable say as number of operations per second (ops), if my
score is 10 ops, then a 100% increase of speed => 20 ops.
I love percents, for you can say one thing, and be sure another will be
understood ;)


2013/12/12 Eliot Miranda <eliot.miranda at gmail.com>

>
>
>
>
> On Thu, Dec 12, 2013 at 2:53 PM, Nicolas Cellier <
> nicolas.cellier.aka.nice at gmail.com> wrote:
>
>>
>> But he said increase in speed, not performance.
>>
>
> Same argument.  What does it mean to complete a task 100% faster?  What
> does it mean to reach your destination 100% faster?
>
>
>>
>>
>> 2013/12/12 Eliot Miranda <eliot.miranda at gmail.com>
>>
>>>
>>>
>>>
>>>
>>> On Thu, Dec 12, 2013 at 1:23 PM, Nicolas Cellier <
>>> nicolas.cellier.aka.nice at gmail.com> wrote:
>>>
>>>>
>>>> I would interpret twice as fast, and that's only 50% rather than 100%
>>>> reduction of execution time :)
>>>>
>>>
>>> relative performance = new time - old time / old time.
>>> 2x = -50%
>>> 3x = -75%
>>> etc
>>>
>>> -100% means new time = 0, and performance is infinite.
>>>
>>>
>>>>
>>>>
>>>> 2013/12/12 Eliot Miranda <eliot.miranda at gmail.com>
>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Thu, Dec 12, 2013 at 1:08 PM, phil at highoctane.be <
>>>>> phil at highoctane.be> wrote:
>>>>>
>>>>>>
>>>>>>
>>>>>> http://m.pocketnow.com/2013/11/13/dalvik-vs-art
>>>>>>
>>>>>
>>>>> "The benefits? Some sources are reporting a 50% increase in speed.
>>>>> Others say it’s closer to 100%. Many claim they’ve seen their battery life
>>>>> increase by 25% or more!"
>>>>>
>>>>> Got to love those 100% speed increases.  Apps really fly when they
>>>>> take no time at all...
>>>>>
>>>>> --
>>>>> Eliot
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>> best,
>>> Eliot
>>>
>>>
>>
>>
>
>
> --
> best,
> Eliot
>
>
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